UPC 2023: International workshop on the physics of Ultra Peripheral Collisions

Session

Photoproduction in peripheral collisions

14 Dec 2023, 17:00

Playa del Carmen

Conveners

Photoproduction in peripheral collisions

• Wolfgang Schaefer
• Charlotte Van Hulse

55. Single and double ratio of elastic vector meson production to inclusive hadron production cross section as a possible signal of saturation in UPCs

Huachen Sun (Ohio State University)

14/12/2023, 17:00

Session 3: UPC and saturation

We explore a new ratio of observables in ultra-peripheral A + A and A + p collisions as a potential signal of saturation physics. We consider the ratio R 1 of elastic vector meson photo-production cross section to the inclusive hadron or jet photo-production cross section. The ratio can be measured in the γ + A and γ + p collisions taking place in the UPCs. We label the ratios R 1 (A) and R 1...

57. Photoproduction of J/ψ and dileptons in events with nuclear overlap with ALICE

Nicolas Bizé (Subatech - Nantes Université)

14/12/2023, 17:30

Session 5: EM and peripheral events

Photon-photon reactions and the production of the J/ψ meson through photonuclear reactions have been extensively studied in ultra-peripheral heavy-ion collisions, in which the impact parameter is larger than twice the nuclear radius. In recent years, coherently photoproduced J/ψ and dilepton production via photon-photon interactions have also been observed in nucleus-nucleus (A–A) collisions...

27. Dimuon production at low transverse momentum in peripheral Au+Au collisions at $\sqrt{s_{_{\rm NN}}}$ = 200 GeV at STAR

Ziyang Li

14/12/2023, 18:00

Session 5: EM and peripheral events

The strong electromagnetic field generated by the colliding nuclei in heavy-ion collisions can be represented by a spectrum of photons leading to photon-induced interactions. While such interactions are traditionally studied in ultra-peripheral collisions (UPC) without any nuclear overlap, significant enhancements of dilepton pairs and J/$\psi$ production at very low transverse momentum...

23. Measurements of the properties of photonuclear events in UPC with the ATLAS detector

Sruthy Jyothi Das (University of Colorado Boulder (US))

14/12/2023, 18:30

Session 5: EM and peripheral events

Ultraperipheral collisions of relativistic heavy ion beams lead to a diverse set of photon-nucleus (photonuclear) interactions. The measurements of particle production in photonuclear reactions can shed light on the QCD dynamics of the novel, extremely asymmetric colliding systems, with energies between those available at RHIC and the LHC. Previous studies by ATLAS indicate significant...